Here is a simple recipe for a basic deli mustard that would be perfect for hot dogs or knishes.
Grind the mustard seeds into a fine powder in a coffee or spice grinder (or use bought mustard powder). Combine with the salt, turmeric and flour. Mix the honey and vinegar together. Combine with the dry mixture with a fork until smooth. If it seems a little thin, this is normal since the mustard will thicken on standing. Cover and leave out for a day at room temperature for the flavours to mingle a little. Store in the refrigerator.
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